Using dip after surgery

Has anyone done dip after surgery? If so, are you experiencing headaches?

18 months ago, my brother had bypass surgery. Currently having vertigo and migraine like every day headaches since August or September of last year. He has used dip for 20 years. He has increased usage this llast year to 2+ cans a day and it has been suggested his headaches and associated symptoms are from nicotine poisoning.

Please respond if you have any information relevant to this.

These are the facts.